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battery life shorter than expected

My watch is six months old. In my experience, the battery life is much shorter than documented. GPS mode is auto select. I do not listen music, have no special watch faces installed etc. According to the manual, battery life should be up to 22 hours with these settings. Yet, it seems rather 12 hours at most. For example, my longest run with the watch was six our hours and twenty minutes. Started at 100%, finished at 45%. 

Any settings that could impact this and that I am not aware of? What are the experiences of other users?